docs: def check_arguments(args):
  	"""
  	Validates the arguments passed through the CLI commands.
  
  	:param args: The arguments passed in the CLI, parsed by the docopt module
  	:return: None
  
  	"""
  	projectname_re = re.compile(r'[^a-zA-Z0-9_]')
  	if args['genconfig']:
  		if args['--type'] not in ['scraper', 'crawler']:
  			raise InvalidType("--type has to be 'scraper' or 'crawler'")
  		if args['--selector'] not in ['xpath', 'css']:
  			raise InvalidSelector("--selector has to be 'xpath' or 'css'")
  	if args['generate'] or args['run']:
  		if args['--output_type'] not in ['json', 'csv']:
  			raise InvalidOutputType("--output_type has to be 'json' or 'csv'")
  	if args['genconfig'] or args['generate'] or args['run']:
  		if projectname_re.search(args['<projectname>']) is not None:
  			message = "<projectname> should consist of letters, digits or _"
  			raise InvalidProjectName(message)
  	try:
  		if int(args['--levels']) < 1:
  			message = "--levels should be greater than, or equal to 1"
  			raise InvalidLevels(message)
  	except (TypeError, ValueError):
  		message = " ".join([
  			"--levels should be an integer and not of type",
  			"{}".format(type(args['--levels']))
  		])
  		raise InvalidLevels(message)